Improvement in last-machine



the block K', the mandrel D n t dimmi tatto *uw Y i ROSCOE R. FROHOCK,OF BOSTON, MASSAQI'lUSETTS.

Lehm PaamNo. 88,029, dazed March 23,1869,

The Schedule referred to in these Letters Patent and making part-o! theum,

To all whom it may concern Be itknown that I, Roscoe R. FRoHocK,A ofBoston, in the county of Suffolk, and State 'of Massachusetts, haveinvented certain new and useful Improvements in Last-Machines; and I dohereby declare that the following is a full and exact descriptionthereof, reference being had to the accompanying drawings, and to theletters of reference marked thereon.

To enable others skilled in the art to make and use my invention, I willproceedto describe its nature, construction, an'd operation'.

The nature of my invention consists- First, in hanging the guide uponone swinging trame, and the cutter-wheel upon another, one swingingframe being connected to a sliding bar, which is parallel to andconnectedwith, by a peculiar device, a` second bar, to which the-otherswinging frame is connected, the distance from the p oint of contact ofthe guide to the axis of oscillation of the guide-frame being equal tothe distance of the cutting-point of the cutting-wheels from the axis ofqscillation ot' the cutting-wheel frames.

Second, connectingr the guide swinging frame to the cutter-wheelswinging frame, by means of links, which pivot upon prolongations of theguidefflame, and are connected with slides, which are movable upon agraduated arc, connected with the cutter-wheel swinging frame, said arccoinciding with circumference of circle, which has its @entre at theaforementioned pivot when the guide coincides with the axis of themodel.

Third, connecting the two sliding bars which carry ,the guide-frame andcutter-wheel frame, by means of two links and an adjustable bar andslide, the whole so arranged that the relative longitudinal motion ofthe two sliding bars may be varied at will.

Drawings.

Construction.

A AA, in all the drawings, represent the frame of the machine, to whichall the working-parts are attached. i

B, iig. 1, is a tail-block, which slides upon ways, and is operated bythe hand-screw T.

x B' is a centre, attached to the tail-block B, which, together with themandrel D, serves to hold and revolve being propelled by the gear-wheelD".

B is a tail-block, which slides erated by the hand-screw T.

B is a mandrel, attached to the tail-block B', which, together with themandrel D', serves to hold and revolve the model, K, the mandrel D beingpropelled by the gearwheel D.

. E and E', g. 1, are two gears, running upon jonrnals, inserted in athird, and larger gear, E, the gear upon ways, and is op- E" being heldin position by the stud F, upon which it may revolve, and the stop Thesethree gears, namely, E E E, are so arranged, in combination with thegears D and D', which operate the block K and ,model K, that if E and Emesh into D and D', as represented in the drawings, then the model. willrevolve in an opposite direction to that of the block, so that the last,cut, will be for the opposite foot to the model; that is to say, if themodel is left, the last will be right, and cioe versa.

If the gear E is slipped forward on the stud F, and freed from the stopE, so as to mesh into the gears D and'D, then the two gears, D and D,and consequently the modeland block, will revolve in the same direction,the gearE" having the same number of teeth that the gears D" and D'have, so that the last, cut, will be` for the same foot; that is, if themodel is left, the last will be left, and cioe corsa.

L L and L L, iig. 1, represent the swinging frame, s

to which the cutter-wheels, O and O', are attached.

These frames, one of which, L L', is shown in sec- .tion in fig.v 3,swing upon the sliding rod L4 L, figs. 1,

2, and 3, but cannot move longitudinally upon said rod- M Mand M M, iig.1, represent the swingingframes, to which the guides V VV are attached.t, i

These frames, one of which is also shown in'section, in iig. 3, swingupon the sliding rod M* M, figs. 1, 2,

and 3, but cannot move longitudinally upon said rod..

P* isa link, one end of which is connected to the prolongation of one ofthe guide-frames by the pivot `,P, the other end being connected to theslide P, as shown, 'which is so arranged that it may be made fast bymeans of the thumb-screw, at any desired point on the arc L5.

L5- L6 are curved prolongations of the cutter-'wheel swinging frames,and are so formed as to coincide with the arc of a circle, struck fromthe pivotP as a centre, when the guide V is at the axis of the model,the reason for which will be explained hereafter.

rPhe sliding rod L, figs. 1 and 2, to which the cutterwheel swingingframes are attached, is connected to the corresponding sliding rod M, towhich the guide swilirging flames are attached, by means of the linksIIhese links are pivoted to the ends of the sliding bars L4 M, and alsoswing on a common pivot at N", iig. 2, which unites them to a slidingbox N.

N is an adj ustingdm', swinging upon the pivot W, iig. 2, the end Zbeing held in any desired position by a thumb-screw working in a slot,as shown. lThe operation of this device for regulating the relativemotion by the sliding bars L4 M, and, through them, the guidesaudcutter-wheels, may be explained as follows: 1

As the links N and N as the distance from N" tances W N" z, and W are ofthesame length, and to W is common, the two dis- N y, will always beequal.

'If we complete the triangles W N o; and Vif y,

by drawing the lines W :cv and W y, it will be seen that the base W ywill be longer than the base W x, when the angle 'W N y is larger thanthel angle W but to make this angle larger, we-have `only to move thebar N toward y. When the bar is so moved, as indicated by the dottedlines, any movements of L* will lengthen the base-line N y, and cause Nto slide along on N, thus reducing the angle W N y, and increasing theangle W N" z Ain other words, making the base line W a: proportionallyshorter than the base-line W y, so that the sliding bar L, which carriesthe cutters, will traverse alonger distance than the sliding bar M*wh'ich carries the guides, so that the last, out, will be longer thanthe model, and proporp tionally exact in length.

If N be carried toward x, the reverse of this action will take place,that is, the last out will be shorter than the model. l

When the adjusting-bar is exactlyin the centre, M* and L4 will movetogether, andthe last will be of the lsame length asthe model.- If thesliding bars L* M* are thrown clear back, so that the guides andcuttingv'wheels are in' position, then the pivot at N" will be exactlyover the pivot W, so that the adjusting-bar N" may beset in any desiredposition, without causing L* or M* to move. f

The guide swinging frame M M, is held on the sliding .bar M* by 4meansof a clamp and set-screw, ,1), g. 1, so that it may be movedlongitudinally when desired. This adjustmentbecomes necessary toaccommodate models of dtferent lengt-hs, the two guides V and V' heiligset so that the distance between their pots of contact shall be abouthalt` the length of the m el.

The cutter-wheel swinging frame L' L is held on the sliding bar L* bymeans of a clamp and setfscrew, b', iig. 1, so that it may be movedlongitudinally when desired. This adjustment becomes necessary when itis desired to make lasts of different lengths, the distance between thecutting-points of the two cutterwheels being about half lthe length ofthe last to be ont. For convenience in making these adjustments,divisions' are marked o on thesIiding'rods L* M, as shown in fig. 2.

H' and H are two levers, attached to the sliding bar L. The inner endsof these levers each form the half of a screw-nut, which .clasp over thescrew G, as indicated by H, in gs..2.and 3. When the lew'ers H H, iig.1, are brought together, the said half screwnpts close tightly aroundthe screw G, and the revo-n lution of G willcause a longitudinal motionof the 'screw-nut, and consequently a longitudinal motion of L* M*,which carry the cutter-wheels and guides.

The two levers H' H" are held together by a springclasp, H, figs. 1and3, but when the sliding rod L* has Abeen moved the desired distanceby the action of the screw G, acting in the screw-nut H, then the claspH is thrown o by the staple H, inserted in the frame of the machine,(see lig. 1,) and the levers H H open, and thus free the screw-nut fromthe action of the screw G'. n

When it is desirable to change the block, or last, the swinging framesmay be thrown back, as represented by dotted lines in iig. 3, by meansof the crank and crank-shaft 1t It', figs. 2 and 3.

The lever Q is connected to the sliding bar L*, by the pivot Q', and isused to slide back longitudinally swinging flames, when the machine hascompleted a last, and place them in position to begin a new last.

I will now proceed to describe the mode of action of the gnide-flamesand cutter-wheel frames.

The distance between the mandrel, upon'which sets last and block turn,is equal to the distance between the sliding rods, and also the distancebetween the pivot P and the slide P'.

Therdistance from the point of oscillation of the guide swinging framesto the contacting point of the guides is equal to the distance from thepoint of oscillation of thel cutter-wheel swinging frames to thecontacting point of the cutters. And further, as the' prolongations L5L6, from the cutter-wheel swinging frames, are in arcs of circles,struck from the pivots P P, when the contacting pointsof the guides V Vare at the centre of revolution of the'model, the cutting-points of thecutter-wheels are at the centre of revolution of the block, and thiswill be true for all positions of the slides P P on the arcs L5 L, sothat the cutter-wheels have a corresponding motion, and thelast is madeof the same size, or larger or smaller,

P are located ony the arcs L5 L".

If the links P* P5 are parallel to lines connecting the centres ofoscillation of the swinging frames, then the oscillation of thecutter-wheels will be the same as the the exactsize ofthe model. v

If the slides P P are carried up toward the top of the arcs L? L", thenthe motion of the cutter-wheels will be less than the motionfof theguides, so that the last, made, will be smaller than the model.

If the slides PQP" are carried down to the bottom of the arcs L5 L, thenthe motion of the cutter-wheels will be greater than the motion oftheguides, and the last, out, will be larger than the model.

The arcs L5 L6 have division-lines marked upon them, for convenience inadjusting the machine for lateralvariation in the dimensions of thelast.

The plate c Lover which the bar N moves, is also provided withdivision-lines, .for convenience in adjust# f ing the machine forvariations in the length of the last. v

S and S are springs, connecting the swinging guide frames to the braceS", and serve to press the guides steadily against the model, andalsovvto bling the cutter-wheels to act against the block. Y

The motive-power is communicated to the machine through the plley G*,which', being attached to the same shaft with the ldrum G5, acts throughthe belts U U" to drive the cutter-wheels.

The wheelG operates the small pinion a, fig. 3, and:

through it the wheel D.

What I claim as my invention, and desire to secure by Letters Patent ofthe United States, isA

1. The arrangement of the guide swinging frame M and the cutter-wheelswinging frame L, when operating in combination with each other, asdescribed, and for the purpose s'et forth. y

2. The grading-device,consisting of the arc L, attached to the swingingframe L, in combination with the slide P, link P*, and frame M, arrangedto operate substantially as described and shown, and for the pur# poseset forth.

3. The combination of the sliding bars L* Mi, the links N N', the slideN", and the bar N when constructed and arranged to operate substantiallyas described, and for the purpose set forth.

, ROSCOE R'. FROHQCK.

Witnesses:

FRANK G. PARKER, A. v4Hunv BERRY.

when the guides move away from or toward the centre,

and exactly proportional, accordingly the slides P" oscillation of theguides, so that the last, cut, will be of

